The discrepancy between OH production rates deduced from radio and ultraviolet observations of comets. I - A comparative study of OH radio and UV observations of P/Halley 1986 III in late November and early December 1985

Details The discrepancy between OH production rates deduced from radio and ultraviolet observations of comets. I - A comparative study of OH radio and UV observations of P/Halley 1986 III in late November and early December 1985 The discrepancy between OH production rates deduced from radio and ultraviolet observations of comets. I - A comparative study of OH radio and UV observations of P/Halley 1986 III in late November and early December 1985

Apr 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990a%26a...230..489g&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 230, no. 2, April 1990, p. 489-503.

Astronomy and Astrophysics

Astronomy

24

Comet Tails, Halley'S Comet, Hydroxyl Radicals, Radio Observation, Ultraviolet Astronomy, Brightness Distribution, Ground State, Iue, Line Shape, Comets, Hydroxyl, Production Rate, Radiowave Methods, Ultraviolet, Quenching, Wavelengths, Radicals, Brightness, Radius, Techniques, Comae, Parameters, Comparisons, Photometry, Earth-Based Observations, Astronomy

Scientific paper

OH UV and radio observations of P/Halley in late November and early December have been combined to determine the quenching radius, the total number of radicals in the coma, the OH lifetime, and the OH production rate. The convolution of the UV brightness profile by the radio antenna beams leads to a quenching radius of 65,000 + or - 15,000 km or 70,000 + or - 20,000 km, depending on the quenching model. A new method is proposed for determining the OH lifetime using the moments of the UV strip brightness distribution and of the radio line profile: the OH lifetime, reduced to 1 AU, is 110,000 + or - 30,000 s. and only weakly model-dependent. With these parameters, the UV and radio OH production rates in December 1985 are in reasonable agreement.

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